Table 1 - Temperature of dew point in degrees Fahrenheit

[Pressure = 30.00 inches]

Air
Temp
t

Vapor
Press.
e

Depression of wet-bulb thermometer (t-t')
3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0
2 0.0423 -56
3 0.0444 -43
4 0.0467 -34 -46
5 0.0491 -29 -36 -49
6 0.0515 -25 -30 -39 -53                      
7 0.0542 -21 -26 -31 -41 -58
8 0.0570 -18 -22 -26 -32 -42
9 0.0600 -15 -19 -22 -27 -33 -44
10 0.0631 -13 -16 -19 -23 -27 -34 -45
11 0.0665 -10 -13 -16 -19 -22 -27 -34 -46              
12 0.0699 -8 -10 -13 -15 -19 -22 -27 -34 -47
13 0.0735 -6 -8 -10 -12 -15 -18 -22 -27 -34 -46
14 0.0772 -4 -6 -8 -10 -12 -15 -18 -22 -27 -33 -45
15 0.0810 -2 -4 -5 -7 -9 -12 -15 -18 -21 -26 -32 -44
16 0.0850 0 -2 -3 -5 -7 -9 -11 -14 -17 -20 -25 -31 -42    
17 0.0891 +2 0 -1 -3 -4 -6 -8 -11 -13 -16 -20 -24 -30 -39 -57
18 0.0933 3 +2 +1 -1 -2 -4 -6 -8 -10 -13 -16 -19 -23 -29 -37
19 0.0979 5 4 3 +1 0 -2 -4 -5 -7 -10 -12 -15 -18 -22 -27
20 0.1026 7 6 4 2 +2 0 -1 -3 -5 -7 -9 -11 -14 -17 -21